MB-8903: Rename UPR_REQUEST_TYPE_* to UPR_STATUS_*

Change-Id: Iabb7bd31b5ccee16f461ea334421fb7b9c8718ea
Reviewed-on: http://review.couchbase.org/30542
Reviewed-by: Filipe David Borba Manana <fdmanana@gmail.com>
Tested-by: Volker Mische <volker.mische@gmail.com>